NOCTURNAL URBAN OZONE MAXIMUM IN SUMMER 1994 - DATA FROM GOTEBORG, SWEDEN

摘要

Nocturnal secondary maximum of atmospheric ozone in urban areas during stable atmospheric weather conditions has been reported by several authors (Chung 1977, Samson 1978, Steinberger and Ganor 1979, Liu et al. 1990, Corsmeier et al. 1997, Strassburger and Kuttler 1998, Baumbach and Vogt 1999, Helbig 1999). As no O_3 is produced during the night the nocturnal ozone maximum is explained as an effect of vertical mixing of high concentrations of ozone from higher levels or horizontal transport from rural areas through local wind systems. In this study, nocturnal urban ozone maximum during a summer with high frequency of clear and calm weather was investigated together with meteorological data in order to describe 1. the magnitude, frequency and timing of nocturnal ozone maximum 2. the relative importance of local wind systems and vertical mixing.